I completely understand where you're coming 
from.  I once sold a $5 pencil board for $175 on 
ebay, and it wasn't anything rare.  Basically, 
two girls went crazy on the bidding over night 
(one night it's ~$7, next morning it's $175).  I 
think it's some surreal thing about not actually 
realizing money is on the line until after the 
auction is over.

Don't worry about it.  Frankily, you should 
except the money since I believe e-bay charges a 
percent of the winning bid anyway and you'll have 
to pay for that.  And it's not your fault the bid 
went so high.  Although it shows good morals that 
you feel guilty about it. : )  And like someone 
else said, maybe a couple people out there REALLY 
like that scene in DBZ.  Don't we all get a 
little crazy over cels we just really have to 
have?

Hope it all works out,

Sumeragi